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\author{Derek Lontine}
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\title{Derek Lontine & USS Research Options}
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\LARGE \textbf{Masters Research Options}

\LARGE \textit{Derek Lontine}\normalsize\\[2in]

The following itemized list details some proposed projects that the Computational Solid Mechanics (CSM) group at the University of Utah and US Synthetic have in common. 

The projects listed in this paper are as follows: 
\begin{enumerate}
\item Multiscale Large Deformation Modeling of WC-Co Plasticity and Fracture
\item Random discrete fracture initiation and propagation influence on initial setting of gasket geometry in HPHT apparatus
\item Calibration of material model of highly frictional materials at HPHT
\item Effect of very high confining stress on the strength of WC-Co
\item Calibration and modeling of friction based interface properties at very high contact stresses
\item Large deformation rezoning and re-compaction of highly frictional powdered buttons



%\item Testing material failure at HPHT using cubic press
%\item Calibrating near-hydrostatic compaction model of Pyrophyllite at HPHT
%\item Acoustic emissions and in-situ ultrasonics to aid in the characterization of deformation and failure of pressed powders at high pressure
%\item Influence of HPHT thermal phase change on the mechanical strength of powdered composites

\end{enumerate}

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\begin{figure}
\centering
\includegraphics[width=8cm]{multiscale.png}
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\section{Multi-scale Modeling of Tungsten Carbide Plasticity and Fracture}
\subsection{Brief Description}
Cemented tungsten carbide (WC-Co) is an interesting material to investigate at the micro-mechanical scale. A micro-scale computational model may help to develop greater understanding of how WC-Co behaves when it comes to plastic deformation. Much of the literature on the mechanical properties of WC relates to abrasion and bulk mechanical strength. Very little investigation into plasticity behavior of WC exists.

A multi-scale mechanical simulation of the behavior of cemented tungsten carbide has the potential to advance the designs of WC-Co components. Simulations of the plasticity of WC-Co may yield useful information about the high pressure diamond formation process as well. In many ways WC-Co is very similar to PDC in that the cobalt fills between grains.

Also, a multi-scale model of WC-Co may require that rezoning of cobalt grains is required. Based off of observations at USS, plasticity of WC-Co means that large deformation of cobalt is likely.

%\subsection{Relevance to UofU CSM}
%Prior CSM multi-scale models seem to have been centered around crack formation and development in metals. Modeling of cemented tungsten carbide introduces interesting effects of the interaction between the hardmetal grains and more ductile binder. 

\subsection{Skill Development}

This project is anticipated to develop skills in modeling multi-scale mechanics problems. Abilities developed here will play a significant role in applications of diamond sintering and mechanics. Also, these kinds of analyses can play a significant role in analyzing the performance of PDC in abrasion, impact, and other metrics.

The large deformation aspect of the cobalt grains will help

\subsection{Protecting USS}

The risk posed to USS by working on this project is fairly limited, besides the fact that research time and testing costs may be less useful than desired.
\begin{itemize}
\item \textbf{USS Direct Interest} - Computational model of: 
\subitem Diamond infiltration
\subitem Anvil residual stress and interface modeling
\subitem Model of diamond abrasion process
\subitem Model and design optimization of WC Anvils

\item \textbf{1st Order Removed} - Computational model of WC-Co as cutter substrate 
\item \textbf{2nd Order Removed} - Multi-scale model of ambiguous WC-Co specimens simulating plasticity and fracture 
\end{itemize}



\pagebreak




\section{Large Deformation Re-meshing of Highly Frictional Path-Dependent Materials}

\subsection{Brief Description}

This project is related to the HPHT process. It attempts to help develop learning geared toward the large deformation observed in gasket flow during the HPHT process. The trick with problems that have such large deformations is that material properties get jumbled in the process. Finding a unique method to track the path of individual zones and mapping them such that the gasket is modeled properly.

Other examples

\subsection{Relevance to USS}

\subsection{Protecting USS}
\begin{itemize}
\item \textbf{USS Direct Interest} - Model of CPM in Gasket of Cubic Press
\item \textbf{1st Order Removed} - Model of Pyro in Cubic Press
\item \textbf{2nd Order Removed} - Model of Pyro in Tetrahedral/Belt Press
\end{itemize}








\pagebreak
\section{Effect of Very High Confining Pressure on WC-Co}

\subsection{Brief Description}
How does a confining pressure influence the failure of WC-Co? There seems to be little to no literature on the effect of confining pressure on the strength of a material we regularly use.

The intent of this project is to find the influence of confining pressure on the strength of WC-Co. The goal would be to influence the designs of Anvils. Also, the test methods used here, will help us to define material parameters of other materials of interest (CPM, Salt, etc).

\subsection{Relevance to USS}

\subsection{Protecting USS}

\begin{itemize}
\item \textbf{USS Direct Interest} - Design for increasing strength and loading conditions of WC Anvils
\item \textbf{1st Order Removed} - Test methods for achieving very high confining pressures for reaching 
\item \textbf{2nd Order Removed} - Effect of confining  pressure on the strength on ambiguous WC samples
\end{itemize}





\pagebreak
\section{Calibration of Material Model of Highly Frictional Materials at HPHT}

\subsection{Brief Description}
The intent of this project is to 

\subsection{Skill Development}


\begin{itemize}
\item \textbf{USS Direct Interest} - Computational calibration model of CPM type mixtures in Cubic Press.
\item \textbf{1st Order Removed} - Computational calibration model of Pyrophyllite or MgO in Cubic Press.
\item \textbf{2nd Order Removed} - Computational calibration model of Pyro in "large volume press"
\item \textbf{3rd Order Removed} - Computational calibration model of Pyro in Bridgman anvil cell.
\end{itemize}




\pagebreak



\section{Influence of HPHT thermal phase change on the mechanical strength of powdered composites}
\subsection{Brief Description}





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\end{document}